I'm betting something is amiss in the distributor area, have a look inside the cap for any busted or burned contacts, check the plugs for fouling, check the wires etc. The symptoms you described are very similar to what I went thru with my 350, I found the center contact in the cap was broken. Must have been a real light show inside, lol.
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1970 GMC 1500 Custom
Original 350/TH350
Victoria, BC, Canada
You can wish in one hand and crap in the other.
See which one gets filled first.
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